Thumb splint



FIG. 1 is a top isometric view of the thumb splint showing my new design;

FIG. 2 is a side view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a front view thereof; and,

FIG. 5 is a rear view thereof.

The broken line showing of the hand is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for thumb splint, as shown and described. 